Gaya APA

Bartrum, R, J. (1977). Gray-scale ultrasound: a manual for physicians and technical personnel (1st ed.). Philadelphia: W.B. Saunders Company.

Gaya MLA

Bartrum, Royal, J.. "Gray-scale ultrasound: a manual for physicians and technical personnel". 1st ed. Philadelphia: W.B. Saunders Company, 1977. Text.